Is there ATM machine at terminal 2 at heathrow. Or get to Kings Cross to use ATM to get cash

Yes, there are ATMs.

Just take care to be charged in pounds rather than dollars. If you don't know about this, search for 'DCC'.

Are those bank ATM's?

TTT Moneycorp or Travelex although there's no user fee charged by them.

Just say no to DCC.

I know from prior postings here about T5 that a Travelex ATM is simply a mechanical version of a Travelex Exchange Bureau, which means a several percent exchange rate commission, or bad exchange rate, or fee, or whatever you wish to call it.
What is TTT Moneycorp? is that a bank, or another money broker passing as a machine?
In other words, since we too will be arriving at T2, are there bank ATMs there, or do we have to plan on finding real ATMs after we get into the city?
Since it is currently costing us .6 of 1 percent to withdraw our money from our savings account from a proper ATM, there is no reason for us to spend 5-10% to purchase our money.

They're all just mechanized exchange booths throughout the airport. Not bad for a first dab of fifty bucks or so until you get into town for a bank jobber.

Only a suggestion, but take out 10-20 pounds at the Heathrow ATM's just so you'll have some cash. I do it so I can buy Timeout Magazine, coffee, and a Cadbury orange candy bar for my sugar rush after the overnight flight from LAX. Once you arrive London, check in then locate the closest bank ATM for you larger withdrawal. The proprietor of your place of lodging should know the closest bank ATM or if you know the address of where you'll be staying use Google Maps Satellite view, type in your address, then type in bank ATM in the "search nearby" option. Most likely you'll find a Lloyd's, Barclays, HSBC or Nat West within a couple of blocks and by using the satellite view option you can actually see the ATM when you click on street view. Easy peasy.

Rather than internetting yourself to death you could just pick one of the three in every block. ,

Since Rick's book issues no particular warnings about Heathrow ATMs, I'd say we have no particular concerns about using them.

Rick's books SHOULD state that the Heathrow ATMs are money exchange operations, and not true ATMs. AS has been stated here many times.

As for arrival, we already have some Brit money saved from our last trip, along with two Oyster cards with sufficient funds to Tube into town.

We will arrive with some £. We aren't going into London. Is it safe to assume that any town we should stop in on our drive to Chipping Campden will have a bank ATM?

You can plug your locations into http://www.mastercard.us/cardholder-services/atm-locator.html and search for usable ATMs if you are on Cirrus MasterCard-Maestro network.

Any village that has more than seven buildings will have an atm.

ATMs at Heathrow operate as ATMs if you take care to decline currency conversion and don't withdraw anything apart from sterling. The former is not as always easy or straightforward as it ought to be, but it is possible.

You may encounter DCC at any UK ATM whoever operates them or where they are so don't drop your guard against DCC.

TTT Moneycorp machines are provided by Raphaels Bank.
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Orrrrrrr...just go to a Wells Fargo bank and get what you want, in the denominations you want (Euro, too, if you need some). You don't need 4 weeks worth, just enough to get you started until you come across an ATM later on.

If you think you'll return in the future, be sure to hang onto a few €, £, or whatever. And be sure to keep several coins - for the WCs (men, too!). It's nice to arrive in Europe and hit the ground running...to the WC...with the proper Potty Coins :-)

Yes, the same Wells Fargo that will charge you 5% plus fees for this. If you want to pay your banker for the privilege of purchasing the money you have deposited, fine. I have a lot of charities that are much more deserving of my excess funds.

According to the Cirrus ATM locator, there is now a Moneycorp machine in T5.